黄骅拗陷中区生油岩特征及油源对比

本文研究了黄骅拗陷中区板桥和歧口两个凹陷生油岩的演化特征,将有机质的成熟演化划分为四个阶段;提出该区石油液态窗为85.5～163℃(2000～4200米)。根据烷烃特征,将该区下第三系生油层划分为五种类型,将原油划分为二大类、六亚类。并在上述基础上,进行了油源对比研究,认为板桥凝析油气田的油源来自板桥凹陷沙三段生油岩,而大港油田和唐家河油田的油源来自歧口凹陷的沙二、三段生油岩。

A COMPARATOVE STUDY OF THE CHARACTERISTICS OF SOURCE ROCKS AND OIL SOURCES IN CENTRAL HUAGHUA DEPREESSION

Based on the character of source rocks of the oil pools at Banqiao and Qikou in the central part of Huanghua depression, the process of evolution of organic matter into hydrocarbons is divided into four stages, with the thermal window for oil formation at 85.5-163℃(2,000-4,200 meters). According to the properties of alkanes, source rocks of Paleogene of this area are classified into 5 types and crude oils into 2 main groups in 6 subdivisions. Oil sources are compared on the same basis, which leads to the supposition that the condensates in the pool at Banqiao come from the source rock in No. 3 shahejie Section, while the oil in the pool at Dagang-Tangjiahe has its source in No. 2 and No. 3 Sbahejie sections.